Peanut Butter (smooth): Grams to Cups
1 cup of peanut butter (smooth) = 258 grams
One US cup of peanut butter (smooth) weighs 258 grams. One 250 ml metric cup — the one used in the UK, Australia, New Zealand and Canada — holds 273 grams. To convert any weight, divide the grams by the figure for your cup.
Smooth peanut butter weighs 258 g per cup according to USDA FoodData Central; King Arthur Baking lists 135 g per ½ cup, which is 270 g per cup. Natural peanut butter with the oil stirred back in weighs about the same.
Measuring a sticky paste
Peanut butter is dense and traps air pockets when spooned into a cup, so volume measures tend to come up short. The displacement trick works well: fill a 2-cup liquid measure with 1 cup of cold water, add peanut butter until the water reaches 2 cups, then pour off the water. Or weigh it directly into the bowl.
Two tablespoons — a standard nutrition-label serving — are about 32 g.
Natural and powdered peanut butter
Natural peanut butter separates, and the oil on top weighs less than the paste below. Stir it back in fully before measuring or the proportions of fat and solids in the recipe change. Powdered peanut butter is defatted and weighs a small fraction as much per cup — it is not a substitute by volume.
Why the two references differ
USDA's 258 g per cup and King Arthur's 270 g differ by about 5%. Peanut butter traps air as it is spooned into a cup, and how firmly it is pressed down changes the result; different brands also vary in oil content. For cookies either figure works. For recipes where peanut butter is the main ingredient, such as no-bake bars, weigh it.
Where the 258 g figure comes from
- USDA FoodData Central: 1 cup of “Peanut butter, smooth style, without salt” = 258 g (FDC ID 172470)
- King Arthur Baking ingredient weight chart: Peanut butter, 1/2 cup = 135 g (about 270 g per cup) (chart)
This site uses 258 g per US cup of peanut butter (smooth), spooned and levelled. References checked September 2026.
How many cups is X grams of peanut butter (smooth)?
| Grams | US cups | Metric cups | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g peanut butter (smooth) | ⅛ | ⅛ | 1.55 | 0.88 |
| 50 g peanut butter (smooth) | ¼ | ⅛ | 3.1 | 1.76 |
| 75 g peanut butter (smooth) | ¼ | ¼ | 4.65 | 2.65 |
| 100 g peanut butter (smooth) | ⅜ | ⅜ | 6.2 | 3.53 |
| 110 g peanut butter (smooth) | ⅜ | ⅜ | 6.82 | 3.88 |
| 120 g peanut butter (smooth) | ½ | ½ | 7.44 | 4.23 |
| 125 g peanut butter (smooth) | ½ | ½ | 7.75 | 4.41 |
| 130 g peanut butter (smooth) | ½ | ½ | 8.06 | 4.59 |
| 140 g peanut butter (smooth) | ½ | ½ | 8.68 | 4.94 |
| 150 g peanut butter (smooth) | ⅝ | ½ | 9.3 | 5.29 |
| 170 g peanut butter (smooth) | ⅔ | ⅝ | 10.54 | 6.00 |
| 175 g peanut butter (smooth) | ⅔ | ⅝ | 10.85 | 6.17 |
| 200 g peanut butter (smooth) | ¾ | ¾ | 12.4 | 7.05 |
| 225 g peanut butter (smooth) | ⅞ | ⅞ | 13.95 | 7.94 |
| 240 g peanut butter (smooth) | ⅞ | ⅞ | 14.88 | 8.47 |
| 250 g peanut butter (smooth) | 1 | ⅞ | 15.5 | 8.82 |
| 275 g peanut butter (smooth) | 1⅛ | 1 | 17.05 | 9.70 |
| 300 g peanut butter (smooth) | 1⅛ | 1⅛ | 18.6 | 10.58 |
| 350 g peanut butter (smooth) | 1⅜ | 1¼ | 21.71 | 12.35 |
| 400 g peanut butter (smooth) | 1½ | 1½ | 24.81 | 14.11 |
| 450 g peanut butter (smooth) | 1¾ | 1⅔ | 27.91 | 15.87 |
| 500 g peanut butter (smooth) | 1.94 | 1⅞ | 31.01 | 17.64 |
How to measure peanut butter (smooth) accurately
The 258 g figure assumes the spooned-and-levelled method: spoon the peanut butter (smooth) into a dry measuring cup and sweep the top flat with a straight edge. Scooping the cup through the bag compacts it and gives a heavier cup.
- 1 US cup of peanut butter (smooth) = 258 g
- 1 metric cup (250 ml) of peanut butter (smooth) = 273 g
- ¾ cup = 194 g
- ½ cup = 129 g
- ⅓ cup = 86 g
- ¼ cup = 65 g
- 1 tablespoon = 16.1 g
Frequently asked questions
How many cups is 100 grams of peanut butter (smooth)?
100 grams of peanut butter (smooth) is about ⅜ US cups, based on 258 g per cup, or ⅜ metric cups.
How many grams in a cup of peanut butter (smooth)?
One US cup of peanut butter (smooth) weighs 258 grams. A 250 ml metric cup holds 273 grams.
How many cups is 250 grams of peanut butter (smooth)?
250 grams of peanut butter (smooth) is about 1 US cups, or ⅞ metric cups.
Does a UK cup of peanut butter (smooth) weigh the same as a US cup?
No. A UK, Australian or Canadian metric cup is 250 ml against the US 236.6 ml, so it holds about 5.7% more — 273 g of peanut butter (smooth) rather than 258 g.
How many tablespoons is 100 grams of peanut butter (smooth)?
100 grams of peanut butter (smooth) is about 6.2 tablespoons.
More nuts and seeds conversions: Almond Butter grams to cups.